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| style="height:20px; width:200px; text-align:center;" |[[Micro-organism]]s are too small to see with they eye, so you need a [[microscope]] to see them.
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==Key Stage 3==
===Meaning===
An [[organism]] is any living creature.
===About Organisms===
: All organisms are made of [[Cell (Biology)|cells]].
: If an organism is made of one cell it is called a [[Unicellular]] Organism.
: If an organism is made of many cells it is called a [[Multicellular]] Organism.